SignalWire FreeSWITCH up to 1.11.1 mod_rtmp rtmp_i_connect out-of-bounds

Summaryinfo

A vulnerability was found in SignalWire FreeSWITCH up to 1.11.1. It has been classified as problematic. This affects the function rtmp_i_connect of the component mod_rtmp. This manipulation causes out-of-bounds. This vulnerability appears as CVE-2026-116782. The attack may be initiated remotely. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability has been found in SignalWire FreeSWITCH up to 1.11.1 and classified as problematic. Affected by this vulnerability is the function rtmp_i_connect of the component mod_rtmp. The manipulation with an unknown input leads to a out-of-bounds vulnerability. The CWE definition for the vulnerability is CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect availability. The summary by CVE is:

FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. Prior to 1.11.2, rtmp_i_connect() passed the first RTMP connect argument to amf0_object_get() without checking whether the AMF value was an object. A string or number in place of an AMF object caused union bytes from the message to be interpreted as node pointers and dereferenced. Any client with network access to an enabled mod_rtmp listener could send the malformed connect command before login; the module is disabled in the stock build and configuration. The invalid read reliably crashes FreeSWITCH and ends every active call, while no write, memory disclosure, or code execution has been demonstrated. This issue is fixed in version 1.11.2.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-116782 since 10/26/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available.

Upgrading to version 1.11.2 eliminates this vulnerability.

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Productinfo

Vendor

• SignalWire

Name

• FreeSWITCH

Version

• 1.11.0
• 1.11.1

Website

• Product: https://github.com/signalwire/freeswitch/

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